in a sweat

in a (cold) sweat

very frightened or anxious I dreamed I'd left the tickets at home and woke up in a cold sweat. Just the thought of addressing all those people is enough to bring me out in a cold sweat. (= make me feel very anxious)
See also: sweat
References in classic literature ?
After supper she got out her book and learned me about Moses and the Bulrushers, and I was in a sweat to find out all about him; but by and by she let it out that Moses had been dead a considerable long time; so then I didn't care no more about him, because I don't take no stock in dead people.